1. Use the 375 Field Communicator to access the Fieldbus menu.
2. From the TRANSDUCER menu, select O2 CAL.
3. From O2 CAL, select O2 CAL SETUP.
4. From O2 CAL SETUP, select O2 HIGH GAS. Enter the percent O
2
used for the high test
gas.
5. From O2 CAL SETUP, select O2 LOW GAS. Enter the percent O
2
used for the low test
gas.
6. From the TRANSDUCER menu, select COe CAL SETUP.
7. From COe CAL SETUP, select COe Test Gas. Enter the CO concentration (ppm) used for
the COe test gas.
3.3.3 Setting test gas values with the LOI
Complete the following steps to set test gas values with the LOI.
1. Use the Z pattern to enter the LOI menu tree.
2. From the SYSTEM menu, select Calib Setup.
3. From Calib Setup, select O2 High Gas %. Enter the percent O
2
used for the high O
2
test gas.
4. Press Down to go to the next selection, O2 Low Gas %. Enter the percent O
2
used for
the low O
2
test gas.
5. Press Down several times to display COe Test Gas. Enter the CO concentration (ppm)
used for COe test gas.
3.4
Calibration solenoids
The transmitter can be provided with optional calibration solenoids for the purpose of
performing autocalibration. The solenoids are controlled by the transmitter software and
automatically switch in the proper calibration gas during the calibration cycle.
A transmitter shipped from the factory with calibration solenoids must be configured
before autocalibration can be implemented. The same process must be performed any
time a replacement card stack is installed.
3.4.1
Configuring the calibration solenoids with the Field
Communicator - HART
Complete the following steps to configure the calibration solenoids with the Field
Communicator for the HART communication protocol.
1. Use the 375 Field Communicator to access the HART menu.
2. From the DETAILED SETUP menu, select CAL SETUP.
3. From the CAL SETUP menu, select O2 CAL PARAMS/COe CAL PARAMS.
Configuration and startup
Reference Manual 47
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